[linux-dvb] Re: CX22700 in new Hauppauge USB DVB-T box

[Andrew de Quincey <adq_dvb@lidskialf.net>]

On Friday 01 Oct 2004 00:57, John Dalgliesh wrote:
> Hi folks,
>
> Has anyone run across the latest version of this box yet? Hauppauge have
> changed the hardware in it, just like they did for their PCI product.
>
> The USB interface chip has not changed - well, it has the same pipes and
> it accepts the same commands as far as i2c operations go.
>
> The demod sits on the same address as the CX22702 in the PCI card, except
> that, annoyingly, it's a CX22700 instead of a CX22702.
>
> Haven't checked out the tuner yet but I assume it's a DTT759X like on the
> PCI card (based on its i2c address again).
>
> So, the problem is the demod. The cx22702.c in linux-dvb would fail to
> attach as it probes for the chip on register 31, expecting the value 3.
> The CX22700 has the value 0 in that register.
>
> Does anyone know anything about this chip? Is is pretty much the same as
> the CX22702 as its number suggests? Anything that has to be done
> differently to control it? I haven't tried proceeding past this probe
> (ignoring it) in case it stuffs something up (pretty unlikely I know...
> now if only the two values were 2 and 0 then it would have no hesitation
> in doing so :)
>
> I'm surprised no-one's mentioned it here already actually - unless I
> missed it somehow. I've had two (Mac) users show up with this box already
> and they're pretty keen to get it going. I'll probably try just accepting
> 0 as a value for that register if I don't hear anything back from the
> list...
>
> {P^/
>
> btw Pretty sure that i2c is really working as I scan the bus and get
> non-zero results from other registers/chips.

Oddly enough, the alps_tdmb7 driver is based around the cx22700 chip - I've 
just finished refactoring that driver into a demodulator driver (cx22700.c).